code: def forward(self, x):
      x = self.bn(self.conv(x))
      if self.act == "leaky_relu":
          x = F.leaky_relu(x)
      elif self.act == "hard_swish":
          x = F.hardswish(x)
      return x
  
imports: import paddle
  import paddle.nn
  import paddle.nn.functional
  from paddle import ParamAttr
label_desc: Use image node_id 2 for calling the ConvBNLayer obj's underlying member method code with example usage: obj.forward(x) and returns: x